diff --git a/src/server/gf-server-jsapi.js b/src/server/gf-server-jsapi.js
index bd55c42d3..6729ba528 100644
--- a/src/server/gf-server-jsapi.js
+++ b/src/server/gf-server-jsapi.js
@@ -1,35 +1,38 @@
 var gf = new Object();
 var pgf_base_url = "pgf";
-var pgf_grammar = "grammar.pgf";
 
-gf.translate = function (input,from,to,cat,callback) {
+gf.translate = function (grammar,input,from,to,cat,callback) {
   var args = [];
   args["input"] = input;
   args["from"] = from;
   args["to"] = to;
   args["cat"] = cat;
-  gf.callFunction("translate", args, callback);
+  gf.callFunction(grammar, "translate", args, callback);
 };
 
-gf.complete = function (input,from,cat,callback) {
+gf.complete = function (grammar,input,from,cat,callback) {
   var args = [];
   args["input"] = input;
   args["from"] = from;
   args["cat"] = cat;
-  gf.callFunction("complete", args, callback);
+  gf.callFunction(grammar, "complete", args, callback);
 };
 
-gf.grammar = function (callback) {
-  gf.callFunction("grammar", [], callback);
+gf.grammar = function (grammar, callback) {
+  gf.callFunction(grammar, "", [], callback);
 };
 
-gf.callFunction = function (fun, args, callback) {
+gf.grammars = function (callback) {
+  gf.httpGetJSONP(pgf_base_url, callback);
+};
+
+gf.callFunction = function (grammar, fun, args, callback) {
   var query = "";
   for (var i in args) {
     query += (query == "") ? "?" : "&";
     query += i + "=" + encodeURIComponent(args[i]);
   }
-  var url = pgf_base_url + "/" + pgf_grammar +"/" + fun + query;
+  var url = pgf_base_url + "/" + grammar +"/" + fun + query;
 
   // FIXME: if same domain, use gf.httpGetText
   gf.httpGetJSONP(url, callback);
diff --git a/src/server/simple-client.html b/src/server/simple-client.html
index 7c6c0da0f..a525f99f8 100644
--- a/src/server/simple-client.html
+++ b/src/server/simple-client.html
@@ -9,6 +9,10 @@
     <script type="text/javascript" src="gf-server-jsapi.js"></script>
     <script type="text/javascript" src="translator.js"></script>
     <script type="text/javascript">
+     function getGrammar () {
+        return document.getElementById('grammar').value;
+     }
+
      function updateTranslation () {
         var input = document.getElementById('inputText').value;
         var fromLang = document.getElementById('fromLang').value;
@@ -19,7 +23,24 @@
                           clearTranslation();
                           output.appendChild(formatTranslation(translation));
                        };
-        gf.translate(input, fromLang, toLang, '', callback);
+        gf.translate(getGrammar(), input, fromLang, toLang, '', callback);
+      }
+
+      function updateGrammars () {
+        gf.grammars(populateGrammars);
+      }
+
+      function populateGrammars (grammars) {
+        var l = document.getElementById('grammar');
+        var langs = grammar.languages;
+        for (var i in grammars) {
+          addOption(l, grammars[i].name, grammars[i].name);
+        }
+        updateLanguages();
+      }
+
+      function updateLanguages () {
+        gf.grammar(getGrammar(), populateLangs);
       }
 
       function populateLangs (grammar) {
@@ -44,7 +65,7 @@
             clearCompletion();
             completions.appendChild(formatCompletions(output));
           };
-          gf.complete(input, fromLang, '', callback);
+          gf.complete(getGrammar(), input, fromLang, '', callback);
 //        }
       }
 
@@ -64,7 +85,7 @@
       }
 
       function initialize() {
-        gf.grammar(populateLangs);
+        updateGrammars();
       }
     </script>
     <title>AJAX GF Translator</title>
@@ -76,6 +97,7 @@
           <input type="text" id="inputText" value="" size="50" />
         </p>
         <p>
+          <label>Grammar: <select id="grammar" onchange="updateLanguages()"></select></label>
           <label>From: <select id="fromLang" onchange="update()"><option value="" selected="selected">Any language</option></select></label>
           <label>To: <select id="toLang"  onchange="update()"><option value="" selected="selected">All languages</option></select></label>
           <input type="button" value="Completions" onclick="updateCompletion()" />